| 摘要 |
<p>A hydraulic cylinder (2) having a piston (1) and a linearly extending output shaft (15) controlled by a rotary spool valve (6). The rotary spool valve (6) has a ported outer part (8) rotatable by means of a control lever (7) to pressurize the cylinder (2) and move the piston (1). Linear motion of the piston (1) is converted to rotary movement of a control rod (3) located in a bore of the piston (1) by means of twisted rod section (12). The control rod (3) is coupled to a ported inner part of the rotary spool valve (6) to provide feedback. In an alternative embodiment, the control rod (3) is directly rotated by the control lever (7) to open or close porting between a hole in the piston (1) or output shaft (15) and a spiral groove in the control rod (3) to create a force imbalance across the piston (1), which moves the piston (1) to a new position of equilibrium.</p> |
